Check-valve.



PATENTED FEB. '7, 1905.

J. G. MGOARL.

CHECK VALVE.

APPLIOATION FILED MAR. 14, 1903,

flYVE/VTOR fisepfi C iWCarZ WITNESSES:

UNTTED STATES Patented February 7, 1905.

PATENT OEETQE.

CHECK-VALVE.

SPECIFICATION forming part of Letters Patent No. 782,162, dated February 7, 1905. Application filed March 14,1903. Serial Ila-147,829.

To lr/wl/t [f may concern:

Be it known that I, J osnrn C. MCOARL, a citizen of the United States, residing at \Veston, in the county of Lewis and State of Vest irginia, have invented new and useful Improvements in Cheek-Valves, of which the following is a specification.

My invention relates to new and useful improvements in automatic check-valves especially adapted for equalizing the flow of gas and water where the former is used for heating the latter, also for equalizing other fluids and gases when desired.

The object of the invention is to provide an automatic check-valve of simple construction which does not require the use of springs, levers, weights, or stem-screws for opening the same, this result being accomplished by the pressure of gas, water, and other fluids.

Another object is to provide a valve which operates smoothly and with the minimum amount of friction.

The invention consists in the novel construction and combination of parts hereinafter more fully described and claimed, and illustrated in the accompanying drawing, which is a section through my improved valve.

Referring to the figure by numerals of reference, l and 2 are cylinders arranged one below the other, and the upper cylinder has a supply-pipe 3 and a discharge-pipe 4, While thelower cylinder 2 has a supply-pipe 3anda discharge-pipe at. The inlets and outlets 5 and 6 of the upper cylinder are normally closed by a piston T, and the inlets and outlets 5 and 6" of cylinder 2 are normally closed by a piston T. The two pistons are connected by a rod 8, which extends through the cap 9 of the lower cylinder and the bottom of cylinder 1, suitable glands 10 being provided for preventing leakage at such points. lVithin the cap 11 of the upper cylinder is arranged a screw 12, which is directly above the center of the upper piston 7, and by adjusting said screw from or toward the piston the movement of said piston will be regulated. A bypass 13 13 is arranged within each of the cylinders 1 and 2, respectively, and extends from the upper end thereof down to the discharge-pipe I oi I.

The cylinder 1 also has an inlet-pipe lit near the top thereof for conducting gas through the same, thence through by-pass 13 and discharge-pipe 4 to a pilotlight. \Vhen water to be supplied to a heater enters through the pipe 3" to the cylinder 2, it will force piston 7 upward and will then pass over the partition 15 between the inlet and outlet and into discharge-pipe 4E. The upward movement of the piston in cylinder 2 will cause a corresponding movementof the piston in the cylinder 1, and the gas contained within pipe 3 will promptly pass over the partition 15 in said cylinder 1 and into pipe at to a burner. It is obvious that with this construction of valve the quantity of gas consumel by a burner is regulated by the quantity of water admitted to a heater, and should the water within a heater become exhausted or the supply thereto shut off the pistons will promptly fall into position over the inlets and outlets, and the supply of gas from the supply-pipe 3 will be shut off. Gas is supplied to a pilotlight by inlet-pipe 1%, cylinder 1, by-pass 13, and discharge-pipe 4C. \Vhen the supply of water is cut off to the pipe 3" of cylinder 2, the piston 7 in said cylinder will drop into closing position and the water thereunder within said cylinder will be forced up through the bypass 13 and in position above the piston.

If desired, a bracket 16 may be interposed between the cylinders 1 and 2, so as to permit the same to be readily attached to a heater.

The pilot-light is adapted to be connected to the discharge-pipe L at a point between the casing 1 and the burner of the heater, and therefore gas admitted to said pipe from the by-pass 13 will first be supplied to the pilotlight and the same will burn whether or not a sufficient quantity of gas is admitted to the pipe 4: to be ignited at the burners of the heater.

In using a valve of the construction above described in connection with a heater it is necessary to locate the heater on the lower floor or basement of a building. The outletopening from the heater should be connected to the lower end of the line of pipes used to supply the diiferent apartments of the building with hot water. Discharge-pipe r of the valve 2 is connected to the inlet end of the heater, and the supply-pipe 3 of said valve is connected to the water-main. It will be seen that should a faucet be opened in any one or more of the apartments in the building the pressure from the water-main and throughpipe 3 will raise the piston 7 and pass under it to the heater. The moment the faucet or faucets are closed the water will flow under the piston 7 and will enter the by-pass 13 and flow into cylinder 2. As the area of piston 7 exposed to the action of the water entering valve 2 through by-pass 13 is greater than the area exposed to the action of the water entering through inlet 5*, it will be understood that piston 7 will promptly be seated upon said inlet, and the further admission of Water to the heating system is thus prevented until one or more of the faucets or outlets of the hot-water pipes are opened.

By referring to the drawing it will be seen that the inlets 5 and 5 inclose the outlets 6 and 6 and are concentric therewith, the valveseats formed in said inlets and outlets being beveled.

In the foregoing description I have shown the preferred form of my invention; but I do not limit, myself thereto, as I am aware that modifications may be made therein without departing from the spirit or sacrificing any of the advantages thereof, and I therefore reserve the right to make such changes as fairly fall within the scope of my invention.

I/Vhen the combination is unlocked, it causes an upward movement of rod 8, holdingit stationary, so as to act as a guide for sleeve on valve 7. While in this position valve 7 can be opened and shut by the various pressures of gas, water,and other fluids until combination is locked, causing adownward movement of rod 8 into sleeve 7, holding valve 7 securely shut until unlocked.

Having thus fully described the invention, what is claimed as new is In a device of the character described, the combination with a bracket; of cylinders secured upon the bracket and having outlets, inlets inclosing the outlets, supply-pipes opening into the inlets, discharge-pipes extending tending from the upper ends of the cylinders and their respective outlets, whereby gas entering the last-mentioned inlet-pipe is free to flow continuously through its cylinder to the outlet-pipe.

In testimony whereof I aflix my signature in presence of two witnesses.

JOSEPH C. NIOGARL.

Witnesses:

W. E. PORTER, JOHN N. RYAN. 

